NEOCENE STRATIGRAPHY. 303 



series belongs to the Miocene Tertiary, which hardly seems 

 probable. If the conglomerate is the uppermost mem- 

 ber, then the series may be the result of continuous sedi- 

 mentation through part or all of the Cretaceous and Eocene. 

 It is not easy on the latter theory to explain the presence 

 of such large quantities of the metamorphic rocks, which 

 presumably had just been buried beneath the rest of the 

 section, unless we assume considerable erosion previous 

 to their laying down. In the Pescadero section no evi- 

 dence of a break was observed ; the conglomerate seems 

 to run into the thin-bedded sandstone, the strike and nearly 

 vertical dip being the same in both. 



The conglomerate of the Carmelo series was laid down 

 upon granite. If it is rightly correlated with the con- 

 glomerate of the Pescadero series, then the conglomerate 

 of Pescadero must represent the bottom of the series or 

 else there must have been uplift, erosion, and exposure 

 of the metamorphic rocks between the laying down of 

 the conglomerate and the rest of the series, notwithstand- 

 ing the evidence to the contrary at Pescadero. This up- 

 lift and exposure may have been local. As the evidence 

 seems to favor the latter theory it will be taken tentatively 

 here. 



Professor Lawson estimated the Carmelo series to have 

 a thickness of at least 800 feet.* The conglomerate at 

 Pescadero was estimated to have a thickness of 720 feet 

 at least. Blake gave the San Francisco sandstone a thick- 

 ness of 2000 or 3000 feet.t 



Dr. Antisell, working south of the Santa Cruz Mount- 

 ains, obtained the following section of the strata below 

 the White Miocene shale. 



*Univ. of Cal., Bull. Geol. Dept., vol. i, p. 19. 

 t Rep. Geol. Recoii. in Cal., 1858, p. 153. 



